<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1, user-scalable=no">
    <meta http-equiv="X-UA-Compatible" content="ie=edge,chrome=1">
    <meta name="author" content="姚德秋">
    <title></title>
    <style>
     div
     {width: 200px;
     height: 200px;}
     /* background: linear-gradient(to bottom,red,blue) ;*/
   background: radial-gradient(circle,red,green,oldlace)
    </style>
</head>
<body>
   <div>
   </div>
</body>
</html>